Origin and significance of poikilitic and mosaic peridotite xenoliths in the western Pannonian Basin: geochemical and petrological evidences

Peridotite xenoliths erupted by alkali basaltic volcanoes in the western Pannonian Basin can be divided into two fundamentally contrasting groups. Geochemical characteristics of the abundant protogranular, porphyroclastic and equigranular nodules suggest that these samples originate from an old cons...

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 2014-09, Vol.168 (3), p.1, Article 1054
Main Authors: Embey-Isztin, Antal, Dobosi, Gábor, Bodinier, Jean-Louis, Bosch, Delphine, Jenner, G. A., Pourtales, Simone, Bruguier, Olivier
Format: Article
Language:English
Subjects:
Chemical properties
Earth and Environmental Science
Earth Sciences
Flow system
Geochemistry
Geology
Inclusions
Lithosphere
Mineral Resources
Mineralogy
Minerals
Original Paper
Petrology
Rocks
Rocks, Igneous
Sciences of the Universe
Volcanoes
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Summary:Peridotite xenoliths erupted by alkali basaltic volcanoes in the western Pannonian Basin can be divided into two fundamentally contrasting groups. Geochemical characteristics of the abundant protogranular, porphyroclastic and equigranular nodules suggest that these samples originate from an old consolidated and moderately depleted lithospheric mantle domain. In contrast, the geochemical features of the worldwide rare, but in the Pannonian Basin relatively abundant, poikilitic xenoliths attest to a more complex evolution. It has been argued that the origin of the peculiar texture and chemistry may be intimately linked to melt/rock reactions at successively decreasing liquid volumes in a porous melt flow system. The most likely site where such reactions can take place is the asthenosphere–lithosphere boundary. In this context, poikilitic xenoliths may provide petrological and geochemical evidence for reactions between magmatic liquids issued from the uprising asthenosphere and the solid mantle rocks of the lithosphere. These reactions are important agents of the thermal erosion of the lithosphere; thus, they could have considerably contributed to the thinning of the lithosphere in the Pannonian region. We suggest that in the Pannonian Basin, there could be a strong relation between the unusual abundance of poikilitic mantle xenoliths and the strongly eroded lithosphere.
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-014-1054-y